Lantronix XPort User Manual download pdf (Page 46)

5: GPIO Interface

XPort™ User Guide 46

Guidelines

The GPIO control protocol is described from the PC side. Send means from PC to

XPort. Response comes from XPort to PC.

The protocol allows for control of up to 32 GPIOs. How many are actually available

depends on the product. XPort has only three.

The parameters are four bytes long and represent GPIOs 0-31, with GPIO0 in bit 0 of

the first byte (Little Endian). Parameter bits for configurable pins not configured as

GPIOs are undefined for Get commands and ignored on Set commands.

Every command consists of nine bytes: one command type of one byte and two

parameters of four bytes each.

Command Parameter 1 Parameter 2

0 1 2 3 4 5 6 7 8

On some commands, one or all parameters are ignored.

For UDP, command type and parameters need to be in the same datagram.

Responses to valid commands are always five bytes long, consisting of the returned

command byte and as parameters in the current or updated values. In case of an

invalid command, only one byte with value 0FFh is returned.

Command Parameter 1

0 1 2 3 4

When sending a command (TCP and UDP), wait for the response before sending the

next command.

Commands

Byte 0 Command Types

10h Get functions

11h Get directions (input or output)

12h Get active levels (high active or low active)

13h Get current states (active or not active)

19h Set directions

1Ah Set active levels

1Bh Set current states

There is no Set functions command. Since the pin’s function depends on the

hardware in which the XPort is embedded, that configuration is only allowed via

77FE. Settings changed by any of the Set commands are not stored and are lost

when the unit is powered down or rebooted.

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Lantronix XPort User Manual Page 46